Variance and standard deviation

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Last updated 8:56 PM on 3/24/23
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10 Terms

1
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What are variance and standard deviation measures of?
Measures of spread- they tell us how spread out the data is
2
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What is variance represented by?
Sigma squared
Sigma squared
3
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What is standard deviation represented by?
Sigma
Sigma
4
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What is the method to calculate variance that is better for explaining what variance is?
Look how far each number is from the mean

Then square it

Then divide by how many numbers there are
5
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What is the method to calculate variance that we will use more often?
Use equation
Use equation
6
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How do we calculate standard deviation?
Use equation
Use equation
7
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What does this represent?
What does this represent?
The mean (sum of data/total)
8
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What does this represent?
What does this represent?
The mean
9
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What does this represent?
What does this represent?
The sum of
10
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For grouped data, such as a table, how do calculate standard deviation?
Add fx and fx squared
Add fx and fx squared